Wireless Device Spatial Diversity Estimation for MIMO Beam Selection
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Solution Overview
Problem
In wireless communication networks, especially with 5G technologies, beamforming reliability is challenged by increased sensitivity to time and space variations at higher frequencies, leading to a rapid drop in Signal to Interference plus Noise Ratio (SINR), which affects the selection of optimal beams for data transmission, resulting in reduced network performance.
Innovation Solution
A method where wireless devices estimate the spatial diversity of received reference signals based on radio network node and beam indications, generating a measurement report that prioritizes spatially diversified signals for simultaneous multiple transmissions, allowing the radio network node to determine the most effective beams for data transmission, thereby improving throughput and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to enhance signal strength for individual connections, then throughput and coverage are improved, but the system becomes more sensitive to time and space variations, causing rapid SINR drop
Solution Approach 1:
The wireless device performs preliminary estimation of spatial diversity of received reference signals before beam selection. By evaluating spatial diversity characteristics in advance, the device can identify beams that are less susceptible to rapid fading, enabling the network to select more reliable beams proactively rather than reactively after SINR degradation occurs.
Solution Approach 2:
The wireless device feeds back spatial diversity information of received reference signals to the network node through measurement reports. This feedback mechanism enables the network to understand the spatial characteristics of incoming signals and adjust beamforming strategies accordingly, creating a closed-loop system that adapts to changing channel conditions and maintains reliability.
2Strength
If multiple transmit antennas are used for beamforming, then signal concentration in desired directions is achieved, but the complexity of beam selection and management increases
Solution Approach 1:
The wireless device autonomously estimates the spatial diversity of received reference signals from multiple transmit antennas without requiring complex network coordination. By performing self-assessment of spatial characteristics, the device simplifies the overall beam management process, allowing the network to leverage device capabilities rather than managing all complexity centrally.
Solution Approach 2:
Spatial diversity estimation acts as an intermediary metric that bridges the gap between raw reference signal measurements and beam selection decisions. This intermediate parameter simplifies the decision-making process by providing a concise characterization of beam quality that directly informs selection, reducing the complexity of managing multiple antenna beams.
3Reliability
If reference signals are transmitted from multiple radio network nodes, then spatial diversity is increased, but the difficulty of identifying and selecting optimal beams increases
Solution Approach 1:
The wireless device changes the parameter being measured from raw signal strength alone to spatial diversity characteristics of reference signals. By transforming the measurement parameter to focus on spatial distribution patterns, the device can effectively distinguish and evaluate beams from multiple radio network nodes, making beam identification and selection more manageable despite increased complexity from multiple sources.
Data Source
AI summary
Embodiments herein relate to a method performed by a wireless device (10) for managing communication in a wireless communication network. The wireless device receives reference signals from one or more radio network nodes. The wireless device (10) estimates to what extent the received reference signals are received spatially diversified based on a radio network node indication indicating from which radio network node the reference signal was sent, and/or on a beam indication indicating in what direction the reference signal was sent toward the wireless device. The wireless device (10) then generates a measurement report by adding selected reference signals into the measurement report, which reference signals are selected for simultaneous multiple transmissions of data to the wireless device (10) taking into account the estimated extent that the received reference signals are received spatially diversified. The wireless device (10) then transmits the measurement report to a radio network node (12) in the wireless communication network (1).